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| author | Jens Axboe <axboe@suse.de> | 2006-06-13 08:26:10 +0200 |
|---|---|---|
| committer | Jens Axboe <axboe@nelson.home.kernel.dk> | 2006-06-23 17:10:39 +0200 |
| commit | b31dc66a54ad986b6b73bdc49c8efc17cbad1833 (patch) | |
| tree | 5591383c1cbffe11512da889c971f899333f1a44 /block/ll_rw_blk.c | |
| parent | 271f18f102c789f59644bb6c53a69da1df72b2f4 (diff) | |
| download | lwn-b31dc66a54ad986b6b73bdc49c8efc17cbad1833.tar.gz lwn-b31dc66a54ad986b6b73bdc49c8efc17cbad1833.zip | |
[PATCH] Kill PF_SYNCWRITE flag
A process flag to indicate whether we are doing sync io is incredibly
ugly. It also causes performance problems when one does a lot of async
io and then proceeds to sync it. Part of the io will go out as async,
and the other part as sync. This causes a disconnect between the
previously submitted io and the synced io. For io schedulers such as CFQ,
this will cause us lost merges and suboptimal behaviour in scheduling.
Remove PF_SYNCWRITE completely from the fsync/msync paths, and let
the O_DIRECT path just directly indicate that the writes are sync
by using WRITE_SYNC instead.
Signed-off-by: Jens Axboe <axboe@suse.de>
Diffstat (limited to 'block/ll_rw_blk.c')
| -rw-r--r-- | block/ll_rw_blk.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/block/ll_rw_blk.c b/block/ll_rw_blk.c index 17c42ddd31db..2270bb451385 100644 --- a/block/ll_rw_blk.c +++ b/block/ll_rw_blk.c @@ -2827,6 +2827,9 @@ static void init_request_from_bio(struct request *req, struct bio *bio) if (unlikely(bio_barrier(bio))) req->flags |= (REQ_HARDBARRIER | REQ_NOMERGE); + if (bio_sync(bio)) + req->flags |= REQ_RW_SYNC; + req->errors = 0; req->hard_sector = req->sector = bio->bi_sector; req->hard_nr_sectors = req->nr_sectors = bio_sectors(bio); |